package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.UserLoginVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    private static final String URL ="https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 用户登录的接口
     * @param userLoginDTO
     * @return
     */
    @Override
    @Transactional
    public UserLoginVO userLogin(UserLoginDTO userLoginDTO) {
        //请求微信服务接口 获取openid
        HashMap map = new HashMap();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",userLoginDTO.getCode());
        map.put("grant_type","authorization_code");
        String doGetRespone = HttpClientUtil.doGet(URL, map); //这是获取的是一个json字符串
        JSONObject jsonObject = (JSONObject) JSON.parse(doGetRespone); //将字符串转换为java对象
        String openid = jsonObject.getString("openid");//解析java对象获取openid

        //判断openid是否为空 如果为空表示登录失败，抛出业务异常
        if (openid==null || openid.equals("" )){
            throw new LoginFailedException("登录失败");
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid); //查询当前openid对应的用户
        if (user==null){ //新用户
            //如果是新用户自动完成注册
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);

        }
        //注册完成后 需要返回插入数据的id
        return new UserLoginVO(user.getId(),openid,null);
    }
}
